. ♪ [car horn honks] our outback always gets us there... ... somemes it just takes us a little longer to get back ♪ >> they took a saturday urn 5 rocket and tipped it upside down at the blast off. probably 100 foot flame length. >>reporter: san bruno fire. disaster so big even commercial airline pilots were calling it in. >> sounded kind of like a jet engine. high pitch screaming sound. >>reporter: firefighters reflects on the san bruno disaster. >>> good evening. i'm dan. more than 200 emergency personnel rushed to the neighborhood last thursday. many off duty and without knowing what they were rushing into. tonight the incredible story from abc 7. >> we looked out the back door and could see a fire ball. >>reporter: the fire ball was just the beginning. >> initially we are thinking that jet airplane went down from san francisco airport. >> i personally was thinking it might be a terrorist thing. >> it appears we have a plane down there in the neighborhood. >>reporter: it would be more than 20 minute before these first responders realize it wasn't an airplane crash. >> this thing w